1. I'm not a fan of grip safeties, they seem a tad archaic at this point in handgun development.
Well, grip safeties have a 150 year history of success starting with the "Lemon Squeezer" and are still commonly used yet today on firearms ranging from the venerated 1911 to the XD series and the S&W EZ series. If you don't like grip safeties, that's fine. A lot of people don't. But there's no denying that grip safeties have a proven track record, many people like them, and they're still in use.
2. Does the polymer framed version do anything a Ruger Security 9 won't do at a lower price point?
Yes. It's smaller, thinner, and lighter, while being optics ready out of the box with "hoods" for pretty much any optics cut you want (according to Chad at KT anyway).
3. The the alloy frame version do anything that guns like the CZ-75 won't do at a lower price point?
Yes. It's smaller, thinner, and lighter, while being optics ready out of the box with "hoods" for pretty much any optics cut you want.
I feel like this is late to the game and still manages to swing and miss.
That's fair. I also feel like they're really late to the game.
I'm not saying that any of these reasons should make you go put an order in, but I am saying that, yes, there is a place in the market I think. No a grip safety isn't a horrible negative point and no, the Ruger Security 9 and CZ-75 are not what it is competing against. Based on the dimensions and capacity, it is competing against the Sig P365XL and the Glock G43X with Shield Arms mags.
Can it compete against the Sig and the Glock? I don't know. But comparing the P15 to a Security 9 is like comparing a motocycle to a delivery van; they're not intended for the same purpose.
Peace favor your sword,
Kirk